The quiet rollout of the new trial on board the 08:19 (Monday 23/04/2018 carriage No. 1 Surbiton->Waterloo) seems to have been a pretty good success so far!
My observation, feedback and comments for future improvements:
This post still makes me chuckle. I was on the 1639 from WAT to PMH yesterday and must have been 75% of the carriage asleep in a sort of induced coma state.